/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iotdb.db.mpp.plan.planner.plan.node.write;

import org.apache.iotdb.common.rpc.thrift.TRegionReplicaSet;
import org.apache.iotdb.common.rpc.thrift.TSStatus;
import org.apache.iotdb.commons.exception.MetadataException;
import org.apache.iotdb.commons.path.PartialPath;
import org.apache.iotdb.commons.utils.StatusUtils;
import org.apache.iotdb.db.mpp.common.schematree.ISchemaTree;
import org.apache.iotdb.db.mpp.plan.analyze.Analysis;
import org.apache.iotdb.db.mpp.plan.planner.plan.node.*;
import org.apache.iotdb.tsfile.exception.NotImplementedException;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.*;

public class InsertMultiTabletsNode extends InsertNode implements BatchInsertNode {

    /**
     * the value is used to indict the parent InsertTabletNode's index when the parent
     * InsertTabletNode is split to multi sub InsertTabletNodes. if the InsertTabletNode have no
     * parent plan, the value is zero;
     *
     * <p>suppose we originally have three InsertTabletNodes in one InsertMultiTabletsNode, then the
     * initial InsertMultiTabletsNode would have the following two attributes:
     *
     * <p>insertTabletNodeList={InsertTabletNode_1,InsertTabletNode_2,InsertTabletNode_3}
     *
     * <p>parentInsetTablePlanIndexList={0,0,0} both have three values.
     *
     * <p>if the InsertTabletNode_1 is split into two sub InsertTabletNodes, InsertTabletNode_2 is
     * split into three sub InsertTabletNodes, InsertTabletNode_3 is split into four sub
     * InsertTabletNodes.
     *
     * <p>InsertTabletNode_1={InsertTabletNode_1_subPlan1, InsertTabletNode_1_subPlan2}
     *
     * <p>InsertTabletNode_2={InsertTabletNode_2_subPlan1, InsertTabletNode_2_subPlan2,
     * InsertTabletNode_2_subPlan3}
     *
     * <p>InsertTabletNode_3={InsertTabletNode_3_subPlan1, InsertTabletNode_3_subPlan2,
     * InsertTabletNode_3_subPlan3, InsertTabletNode_3_subPlan4}
     *
     * <p>those sub plans belong to two different raft data groups, so will generate two new
     * InsertMultiTabletNodes
     *
     * <p>InsertMultiTabletNodet1.insertTabletNodeList={InsertTabletNode_1_subPlan1,
     * InsertTabletNode_3_subPlan1, InsertTabletNode_3_subPlan3, InsertTabletNode_3_subPlan4}
     *
     * <p>InsertMultiTabletNodet1.parentInsetTablePlanIndexList={0,2,2,2}
     *
     * <p>InsertMultiTabletNodet2.insertTabletNodeList={InsertTabletNode_1_subPlan2,
     * InsertTabletNode_2_subPlan1, InsertTabletNode_2_subPlan2, InsertTabletNode_2_subPlan3,
     * InsertTabletNode_3_subPlan2}
     *
     * <p>InsertMultiTabletNodet2.parentInsetTablePlanIndexList={0,1,1,1,2}
     *
     * <p>this is usually used to back-propagate exceptions to the parent plan without losing their
     * proper positions.
     */
    List<Integer> parentInsertTabletNodeIndexList;

    /**
     * the InsertTabletNode list
     */
    List<InsertTabletNode> insertTabletNodeList;

    /**
     * record the result of insert tablets
     */
    private final Map<Integer, TSStatus> results = new HashMap<>();

    public InsertMultiTabletsNode(PlanNodeId id) {
        super(id);
        parentInsertTabletNodeIndexList = new ArrayList<>();
        insertTabletNodeList = new ArrayList<>();
    }

    public InsertMultiTabletsNode(
            PlanNodeId id,
            List<Integer> parentInsertTabletNodeIndexList,
            List<InsertTabletNode> insertTabletNodeList) {
        super(id);
        this.parentInsertTabletNodeIndexList = parentInsertTabletNodeIndexList;
        this.insertTabletNodeList = insertTabletNodeList;
    }

    public List<Integer> getParentInsertTabletNodeIndexList() {
        return parentInsertTabletNodeIndexList;
    }

    private void setParentInsertTabletNodeIndexList(List<Integer> parentInsertTabletNodeIndexList) {
        this.parentInsertTabletNodeIndexList = parentInsertTabletNodeIndexList;
    }

    public List<InsertTabletNode> getInsertTabletNodeList() {
        return insertTabletNodeList;
    }

    private void setInsertTabletNodeList(List<InsertTabletNode> insertTabletNodeList) {
        this.insertTabletNodeList = insertTabletNodeList;
    }

    public void addInsertTabletNode(InsertTabletNode node, Integer parentIndex) {
        insertTabletNodeList.add(node);
        parentInsertTabletNodeIndexList.add(parentIndex);
    }

    @Override
    public void setSearchIndex(long index) {
        searchIndex = index;
        insertTabletNodeList.forEach(plan -> plan.setSearchIndex(index));
    }

    @Override
    public void validateAndSetSchema(ISchemaTree schemaTree) throws MetadataException {
        for (InsertTabletNode insertTabletNode : insertTabletNodeList) {
            insertTabletNode.validateAndSetSchema(schemaTree);
            if (!this.hasFailedMeasurements() && insertTabletNode.hasFailedMeasurements()) {
                this.failedMeasurementIndex2Info = insertTabletNode.failedMeasurementIndex2Info;
            }
        }
    }

    @Override
    protected boolean checkAndCastDataType(int columnIndex, TSDataType dataType) {
        return false;
    }

    @Override
    public List<WritePlanNode> splitByPartition(Analysis analysis) {
        Map<TRegionReplicaSet, InsertMultiTabletsNode> splitMap = new HashMap<>();
        for (int i = 0; i < insertTabletNodeList.size(); i++) {
            InsertTabletNode insertTabletNode = insertTabletNodeList.get(i);
            List<WritePlanNode> tmpResult = insertTabletNode.splitByPartition(analysis);
            for (WritePlanNode subNode : tmpResult) {
                TRegionReplicaSet dataRegionReplicaSet = ((InsertNode) subNode).getDataRegionReplicaSet();
                if (splitMap.containsKey(dataRegionReplicaSet)) {
                    InsertMultiTabletsNode tmpNode = splitMap.get(dataRegionReplicaSet);
                    tmpNode.addInsertTabletNode((InsertTabletNode) subNode, i);
                } else {
                    InsertMultiTabletsNode tmpNode = new InsertMultiTabletsNode(this.getPlanNodeId());
                    tmpNode.setDataRegionReplicaSet(dataRegionReplicaSet);
                    tmpNode.addInsertTabletNode((InsertTabletNode) subNode, i);
                    splitMap.put(dataRegionReplicaSet, tmpNode);
                }
            }
        }
        return new ArrayList<>(splitMap.values());
    }

    public Map<Integer, TSStatus> getResults() {
        return results;
    }

    public TSStatus[] getFailingStatus() {
        return StatusUtils.getFailingStatus(results, insertTabletNodeList.size());
    }

    @Override
    public List<PlanNode> getChildren() {
        return null;
    }

    @Override
    public void addChild(PlanNode child) {
    }

    @Override
    public PlanNode clone() {
        throw new NotImplementedException("clone of Insert is not implemented");
    }

    @Override
    public int allowedChildCount() {
        return NO_CHILD_ALLOWED;
    }

    @Override
    public List<String> getOutputColumnNames() {
        return null;
    }

    @Override
    public List<PartialPath> getDevicePaths() {
        List<PartialPath> partialPaths = new ArrayList<>();
        for (InsertTabletNode insertTabletNode : insertTabletNodeList) {
            partialPaths.add(insertTabletNode.devicePath);
        }
        return partialPaths;
    }

    @Override
    public List<String[]> getMeasurementsList() {
        List<String[]> measurementsList = new ArrayList<>();
        for (InsertTabletNode insertTabletNode : insertTabletNodeList) {
            measurementsList.add(insertTabletNode.measurements);
        }
        return measurementsList;
    }

    @Override
    public List<TSDataType[]> getDataTypesList() {
        List<TSDataType[]> dataTypesList = new ArrayList<>();
        for (InsertTabletNode insertTabletNode : insertTabletNodeList) {
            dataTypesList.add(insertTabletNode.dataTypes);
        }
        return dataTypesList;
    }

    @Override
    public List<Boolean> getAlignedList() {
        List<Boolean> alignedList = new ArrayList<>();
        for (InsertTabletNode insertTabletNode : insertTabletNodeList) {
            alignedList.add(insertTabletNode.isAligned);
        }
        return alignedList;
    }

    public static InsertMultiTabletsNode deserialize(ByteBuffer byteBuffer) {
        PlanNodeId planNodeId;
        List<InsertTabletNode> insertTabletNodeList = new ArrayList<>();
        List<Integer> parentIndex = new ArrayList<>();

        int size = byteBuffer.getInt();
        for (int i = 0; i < size; i++) {
            InsertTabletNode insertTabletNode = new InsertTabletNode(new PlanNodeId(""));
            insertTabletNode.subDeserialize(byteBuffer);
            insertTabletNodeList.add(insertTabletNode);
        }
        for (int i = 0; i < size; i++) {
            parentIndex.add(byteBuffer.getInt());
        }

        planNodeId = PlanNodeId.deserialize(byteBuffer);
        for (InsertTabletNode insertTabletNode : insertTabletNodeList) {
            insertTabletNode.setPlanNodeId(planNodeId);
        }

        InsertMultiTabletsNode insertMultiTabletsNode = new InsertMultiTabletsNode(planNodeId);
        insertMultiTabletsNode.setInsertTabletNodeList(insertTabletNodeList);
        insertMultiTabletsNode.setParentInsertTabletNodeIndexList(parentIndex);
        return insertMultiTabletsNode;
    }

    @Override
    protected void serializeAttributes(ByteBuffer byteBuffer) {
        PlanNodeType.INSERT_MULTI_TABLET.serialize(byteBuffer);

        ReadWriteIOUtils.write(insertTabletNodeList.size(), byteBuffer);

        for (InsertTabletNode node : insertTabletNodeList) {
            node.subSerialize(byteBuffer);
        }
        for (Integer index : parentInsertTabletNodeIndexList) {
            ReadWriteIOUtils.write(index, byteBuffer);
        }
    }

    @Override
    protected void serializeAttributes(DataOutputStream stream) throws IOException {
        PlanNodeType.INSERT_MULTI_TABLET.serialize(stream);

        ReadWriteIOUtils.write(insertTabletNodeList.size(), stream);

        for (InsertTabletNode node : insertTabletNodeList) {
            node.subSerialize(stream);
        }
        for (Integer index : parentInsertTabletNodeIndexList) {
            ReadWriteIOUtils.write(index, stream);
        }
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        if (!super.equals(o)) return false;
        InsertMultiTabletsNode that = (InsertMultiTabletsNode) o;
        return Objects.equals(parentInsertTabletNodeIndexList, that.parentInsertTabletNodeIndexList)
                && Objects.equals(insertTabletNodeList, that.insertTabletNodeList);
    }

    @Override
    public int hashCode() {
        return Objects.hash(super.hashCode(), parentInsertTabletNodeIndexList, insertTabletNodeList);
    }

    @Override
    public <R, C> R accept(PlanVisitor<R, C> visitor, C context) {
        return visitor.visitInsertMultiTablets(this, context);
    }

    @Override
    public long getMinTime() {
        throw new NotImplementedException();
    }

    @Override
    public Object getFirstValueOfIndex(int index) {
        throw new NotImplementedException();
    }
}
